如何使用SpringRestTemplate访问restful服务-创新互联

一. 什么是RestTemplate

Spring's central class for synchronous client-side HTTP access.
It simplifies communication with HTTP servers, and enforces RESTful principles.
It handles HTTP connections, leaving application code to provide URLs(with possible template variables) and extract results.

 上面这段是RestTemplate类中的简单介绍，RestTemplate是Spring3.0后开始提供的用于访问 Rest 服务的轻量级客户端，相较于传统的HttpURLConnection、Apache HttpClient、OkHttp等框架，RestTemplate大大简化了发起HTTP请求以及处理响应的过程。本文关注RestTemplate是如何使用的，暂不涉及内部的实现原理。

二.一个简单的例子。

定义一个简单的restful接口

@RestController
public class TestController
{
  @RequestMapping(value = "testPost", method = RequestMethod.POST)
  public ResponseBean testPost(@RequestBody RequestBean requestBean)
  {
    ResponseBean responseBean = new ResponseBean();
    responseBean.setRetCode("0000");
    responseBean.setRetMsg("succ");

    return responseBean;
  }
}